TrackingAction.cc

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// $Id: TrackingAction.cc 78307 2013-12-11 10:55:57Z gcosmo $
// 
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#include "TrackingAction.hh"

#include "HistoManager.hh"
#include "Run.hh"
#include "EventAction.hh"
#include "TrackingMessenger.hh"

#include "G4Track.hh"
#include "G4ParticleTypes.hh"
#include "G4RunManager.hh"

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TrackingAction::TrackingAction(EventAction* EA)
:G4UserTrackingAction(),
 fEvent(EA),fTrackMessenger(0),
 fFullChain(true)
 
{
  fTrackMessenger = new TrackingMessenger(this);   
}

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TrackingAction::~TrackingAction()
{
  delete fTrackMessenger;
}

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void TrackingAction::PreUserTrackingAction(const G4Track* track)
{
  Run* run 
   = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
         
  G4ParticleDefinition* particle = track->GetDefinition();
  G4String name   = particle->GetParticleName();
  fCharge = particle->GetPDGCharge();
  fMass   = particle->GetPDGMass();  
    
  G4double Ekin = track->GetKineticEnergy();
  G4int ID      = track->GetTrackID();
  
  G4bool condition = false;

  //count particles
  //
  if (ID>1) run->ParticleCount(name, Ekin);
  
  //energy spectrum
  //
  G4int ih = 0;
  if (particle == G4Electron::Electron()||
      particle == G4Positron::Positron())  ih = 1;
  else if (particle == G4NeutrinoE::NeutrinoE()||
           particle == G4AntiNeutrinoE::AntiNeutrinoE()) ih = 2;
  else if (particle == G4Gamma::Gamma()) ih = 3;
  else if (particle == G4Alpha::Alpha()) ih = 4;
  else if (fCharge > 2.) ih = 5;
  if (ih) G4AnalysisManager::Instance()->FillH1(ih, Ekin);
  
  //Ion
  //
  if (fCharge > 2.) {
    //build decay chain
    if (ID == 1) fEvent->AddDecayChain(name);
      else       fEvent->AddDecayChain(" ---> " + name);
    // 
    //full chain: put at rest; if not: kill secondary      
    G4Track* tr = (G4Track*) track;
    if (fFullChain)  tr->SetTrackStatus(fStopButAlive);
      else if (ID>1) tr->SetTrackStatus(fStopAndKill);
  }
  
  //example of saving random number seed of this fEvent, under condition
  //
  if (condition) G4RunManager::GetRunManager()->rndmSaveThisEvent();
}

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void TrackingAction::PostUserTrackingAction(const G4Track* track)
{
  //keep only ions
  //
  if (fCharge < 3. ) return;
  
  Run* run 
   = static_cast<Run*>(G4RunManager::GetRunManager()->GetNonConstCurrentRun());
   
  G4AnalysisManager* analysis = G4AnalysisManager::Instance();
  
  //get time
  //   
  G4double time = track->GetGlobalTime();
  G4int ID = track->GetTrackID();
  if (ID == 1) run->PrimaryTiming(time);        //time of life of primary ion  
      
  //energy and momentum balance (from secondaries)
  //
  const std::vector<const G4Track*>* secondaries 
                              = track->GetStep()->GetSecondaryInCurrentStep();
  size_t nbtrk = (*secondaries).size();
  if (nbtrk) {
    //there are secondaries --> it is a decay
    //
    //balance    
    G4double EkinTot = 0.;
    G4ThreeVector Pbalance = - track->GetMomentum();
    for (size_t itr=0; itr<nbtrk; itr++) {
       const G4Track* trk = (*secondaries)[itr];
       EkinTot += trk->GetKineticEnergy();
       //exclude gamma desexcitation from momentum balance
       if (trk->GetDefinition() != G4Gamma::Gamma())         
         Pbalance += trk->GetMomentum();                 
    }
    G4double Pbal = Pbalance.mag();  
    run->Balance(EkinTot,Pbal);  
    analysis->FillH1(6,EkinTot);
    analysis->FillH1(7,Pbal);
  }
  
  //no secondaries --> end of chain    
  //  
  if (!nbtrk) {
    run->EventTiming(time);                     //total time of life
    analysis->FillH1(8,time);
  }
}

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